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Related Concept Videos

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As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.
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Transport Across the Golgi01:26

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While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Cargo sorting at the trans-Golgi network at a glance.

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The Golgi apparatus sorts proteins and lipids for transport. This review details molecular mechanisms for directing cargo to various cellular destinations via distinct export pathways.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Golgi apparatus is a central organelle in eukaryotic cells, responsible for modifying, sorting, and packaging proteins and lipids.
  • It comprises flattened membrane-bound sacs called cisternae, each containing specific resident proteins, primarily enzymes involved in post-translational modifications.
  • Proper functioning of the Golgi is crucial for glycoprotein and lipid biogenesis and intracellular trafficking.

Purpose of the Study:

  • To review current understanding of protein and lipid sorting mechanisms within the Golgi apparatus.
  • To elucidate the molecular features of cargo clients and their sorting into distinct export pathways.
  • To provide a concise overview for researchers in cell biology and related fields.

Main Methods:

  • This work is a review and collation of existing research, not an experimental study.
  • It synthesizes findings from various molecular and cell biology studies.
  • Key concepts are illustrated in an accompanying poster.

Main Results:

  • The Golgi processes glycoproteins and lipids through sequential enzymatic modifications across its cisternae.
  • Cargo is packaged into transport vesicles at the trans-Golgi network (TGN) for delivery to specific organelles.
  • Distinct pathways exist for endo-lysosomal cargo (clathrin-coated vesicles) and cell surface cargo (uncoated carriers).

Conclusions:

  • Significant progress has been made in defining cargo client features and sorting mechanisms.
  • Outstanding questions remain regarding the precise molecular details of Golgi sorting.
  • This review consolidates current knowledge on Golgi trafficking pathways.